[NaCl SDK] nacl_io: handle null irt function pointers

native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/types.h>  // Include something that will define __GLIBC__.
 
 // The entire file is wrapped in this #if. We do this so this .cc file can be
 // compiled, even on a non-glibc build.
 #if defined(__native_client__) && defined(__GLIBC__)
 
@@ skipping 529 matching lines @@
   return REAL(close)(fd);
 }
 
 void _real_exit(int status) {
   CHECK_REAL(exit);
   REAL(exit)(status);
 }
 
 int _real_fstat(int fd, struct stat* buf) {
   struct nacl_abi_stat st;
   CHECK_REAL(fstat);

[binji, 2014/09/17 23:30:45]

here too?

   int err = REAL(fstat)(fd, &st);
   if (err) {
     errno = err;
     return -1;
   }
 
   nacl_stat_to_stat(&st, buf);
   return 0;
 }
 
@@ skipping 26 matching lines @@
   *nread = offset;
   return 0;
 }
 
 int _real_lseek(int fd, off_t offset, int whence, off_t* new_offset) {
   CHECK_REAL(seek);
   return REAL(seek)(fd, offset, whence, new_offset);
 }
 
 int _real_mkdir(const char* pathname, mode_t mode) {
-  CHECK_REAL(mkdir);
+  CHECK_REAL_NOSYS(mkdir);
   return REAL(mkdir)(pathname, mode);
 }
 
 int _real_mmap(void** addr,
                size_t length,
                int prot,
                int flags,
                int fd,
                off_t offset) {
   CHECK_REAL(mmap);
   return REAL(mmap)(addr, length, prot, flags, fd, offset);
 }
 
 int _real_munmap(void* addr, size_t length) {
   CHECK_REAL(munmap);
   return REAL(munmap)(addr, length);
 }
 
 int _real_open(const char* pathname, int oflag, mode_t mode, int* newfd) {
-  CHECK_REAL(open);
+  CHECK_REAL_NOSYS(open);
   return REAL(open)(pathname, oflag, mode, newfd);
 }
 
 int _real_open_resource(const char* file, int* fd) {
-  CHECK_REAL(open_resource);
+  CHECK_REAL_NOSYS(open_resource);
   return REAL(open_resource)(file, fd);
 }
 
 int _real_read(int fd, void* buf, size_t count, size_t* nread) {
   CHECK_REAL(read);
   return REAL(read)(fd, buf, count, nread);
 }
 
 int _real_rmdir(const char* pathname) {
-  CHECK_REAL(rmdir);
+  CHECK_REAL_NOSYS(rmdir);
   return REAL(rmdir)(pathname);
 }
 
 int _real_write(int fd, const void* buf, size_t count, size_t* nwrote) {
   CHECK_REAL(write);
   return REAL(write)(fd, buf, count, nwrote);
 }
 
 int _real_getcwd(char* pathname, size_t len) {
   CHECK_REAL_NOSYS(getcwd);
@@ skipping 14 matching lines @@
   if (s_wrapped) {
     LOG_TRACE("kernel_wrap_uninit");
     EXPAND_SYMBOL_LIST_OPERATION(USE_REAL)
     s_wrapped = false;
   }
 }
 
 EXTERN_C_END
 
 #endif  // defined(__native_client__) && defined(__GLIBC__)